Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3dcbd484f5fb7a…

MALICIOUS

PDF

82.4 KB Created: 2021-03-29 22:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc2a59a8800dfb86d65d0cba5fb7ff7e SHA-1: 439655fda277636d45c661decfb12be86c1d71f9 SHA-256: 7e3dcbd484f5fb7a6b9fc7d5883d61bac0ef7c2f9f202962a5397ef1cdbbfd3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, suggesting a link farm or phishing attempt, with a primary suspicious URL being https://maypoin.ru/award?keyword=tinkle+digest+stories+pdf. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/award?keyword=tinkle+digest+stories+pdf
    • https://cdn.sqhk.co/kaxejelun/ajb7wge/best_antivirus_for_pc_windows_8.pdf
    • https://cdn-cms.f-static.net/uploads/4459185/normal_604367b5390ae.pdf
    • https://cdn-cms.f-static.net/uploads/4502436/normal_603e2b19954a9.pdf
    • https://cdn.sqhk.co/kanemili/hmheiic/soduwezavedewati.pdf
    • https://cdn.sqhk.co/toxinize/hcgn2jf/lovely_pets_quincy_massachusetts.pdf
    • https://cdn-cms.f-static.net/uploads/4407070/normal_6032611225f4a.pdf
    • https://cdn-cms.f-static.net/uploads/4495973/normal_6047358b1486f.pdf
    • https://cdn.sqhk.co/gotuxixovumu/Pgdmgcd/genopa.pdf
    • https://cdn.sqhk.co/vufuvevu/jiekSji/camping_94_app_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/875b46c2-e7c2-4ace-844f-d748606b636a/how_to_test_residential_electrical_wiring.pdf
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_0f53f6c62b1b4076bb03815fb2a4c273.pdf?index=true
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_cc1026cb501540ca9aba515739a337bf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b75d809b-ace8-4e07-88d8-f5cb1012eb1c/moto_g7_play_camera_app.pdf
    • https://0b670cc3-d94b-4117-8b98-7ce677fb6c21.filesusr.com/ugd/7bc559_95d6ffce2b6945da9ad869ab9cc7a025.pdf?index=true
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_a1e902ded9e344cf8f3fbf5fdafb2484.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b7350d22-bc77-4426-a070-20a5df7ea0a6/xunotepuguruvipogijog.pdf
    • https://fefcf4f0-bf52-4086-adb3-b788df03f7bd.filesusr.com/ugd/da9d4c_d3397647cfe8410484d419b2f0e43169.pdf?index=true
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_8458bed507574aa09cdf7bb1efa31871.pdf?index=true
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_bf78b8efb35e4ad3b01047a10b2d594a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39d5aa49-9f2a-416d-8906-9861b9a2a62b/how_to_do_ninjutsu_hand_signs.pdf
    • https://uploads.strikinglycdn.com/files/01f4fe00-3306-47b9-8c04-25395fa66dc2/bomanezetevobaxinazowe.pdf
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_b1f3f36124e74c75a05e698bae746095.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105e2.bin
fc916b0d8c4754d02c74efc479bf4147c036fb473388595e642158ac5685a3c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 5012 bytes
font_01_sfnt_off00011709.bin
aede87eda5aa89947c7da08ee1cc41567f18cb067971b10326e3e3aa285c437c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 10864 bytes

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